JP2000292473A - Method and apparatus for detecting failure of liquid crystal display screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for detecting wiring failure points of a wiring film of a liquid crystal/plasma display screen or the like and an apparatus therefor. SOLUTION: A probe pin 6 is moved above a terminal connected to a wiring film of a liquid crystal display screen. The probe pin 6 is brought in contact with the terminal to supply a predetermined voltage. At the same time, an electromagnetic sensor 7 is moved in parallel to the probe pin 6. The disconnected wiring film is detected by a change of detection signals of the electromagnetic sensor 7. A position of the electromagnetic sensor 7 at the time is stored as position information. Then, the electromagnetic sensor 7 is returned to above the disconnected wiring film, and further moved along the wiring film, whereby a failure point due to the disconnection is detected from the change of detection signals of the electromagnetic sensor 7. A position of the electromagnetic sensor 7 at the time is stored as the failure point because of the disconnection. Since any failure point because of the disconnection present in the wiring film is stored as the position of the electromagnetic sensor 7, a repair position of the liquid crystal display screen can be recognized or the like advantage is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display screen defect detection for detecting a wiring defective portion of a wiring film such as a liquid crystal display screen or a plasma display screen used for a display unit of a television, a personal computer, and other various control devices. A method and an apparatus therefor.

[0002]

2. Description of the Related Art Recently, liquid crystal / plasma display screens (hereinafter referred to as liquid crystal display screens) are used for various products, and the production quantity of the liquid crystal display screens is increasing. This liquid crystal display screen has segments arranged at fine intervals on a plane, a transparent front wiring film connected to the segments in each column, and a rear surface of the segment orthogonal to the front wiring film. A back wiring film extending in the direction and connected to the segments in each row; and a glass plate covering the upper surfaces of the segments. The front and rear wiring films are connected to terminals arranged at fine intervals on an edge of the liquid crystal display screen, and a voltage signal and a control signal are supplied to terminals connected to the front and rear wiring films, respectively. The conductive segments are arbitrarily selected to control the transmission of external light. When detecting a connection failure between the wiring film on the front and back of the liquid crystal display screen and each segment, after attaching the glass plate, a voltage of a predetermined frequency is supplied from a probe pin to a terminal connected to the wiring film, An electromagnetic sensor is arranged on the edge side located on the opposite side, and cutting of the wiring film in each column and each row is detected by a change in an electromagnetic wave appearing at the edge of each wiring film.

[0003]

According to this wiring failure detection method, it is possible to detect a connection failure of each wiring film, but it is not possible to detect at which point the failure is, and it is necessary to perform a repair work. It takes a considerable time to detect the defective position using a CCD camera. For this reason, with the widespread use of large-sized display screens, there is a demand for a wiring failure detection method capable of quickly detecting a portion requiring repair.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned needs, and an object thereof is to provide a method and an apparatus for detecting a defect on a liquid crystal display screen capable of detecting a defective portion of a wiring film connected to each segment. is there.

[0005]

A probe pin is moved at predetermined intervals above a terminal connected to a wiring film of a liquid crystal display screen positioned at a predetermined position, and the probe pin is brought into contact with the terminal. A predetermined voltage is supplied from the probe pin, and the electromagnetic sensor is moved in parallel with the probe pin to determine whether a detection signal of the electromagnetic sensor is equal to or more than a predetermined value, and a position of the electromagnetic sensor when this does not reach the predetermined value. The position information of the broken wiring film is stored, and then the electromagnetic sensor is returned to the position of the broken wiring film, the electromagnetic sensor is moved along the wiring film, and the position of the broken wiring film is detected by a change in the detection signal of the electromagnetic sensor. Is configured to be detected.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a liquid crystal display screen defect detecting device, which includes an X table 3 having a first movable table 3a that moves along an edge of the liquid crystal display screen 2 positioned at a predetermined position; And a Y table 4 fixed to 3a and extending in a direction orthogonal to the X table 3. A predetermined number (N) of probe pins 6 located above terminals of the liquid crystal display screen 2 are fixed to the first movable base 3a via lifting means 5 so as to be able to descend. LCD display screen 2 when moving every pitch (p)
The probe pins 6 are configured to abut on all of the terminals without overlapping. A voltage of a predetermined frequency is supplied to each of the probe pins 6 from a voltage supply unit 12 described later, and an electromagnetic wave is generated in a front wiring film (hereinafter, referred to as a wiring film) of the liquid crystal display screen 2. I have. Also,
The Y table 4 has a second
A movable platform 4a is provided, and the second movable platform 4a is provided with an electromagnetic sensor 7 composed of line sensors (sensor numbers 0 to N-1) arranged in a row corresponding to a predetermined number (N) of wiring films. Are mounted close to the edge of the wiring film. In addition, the electromagnetic sensor 7 is configured to move in parallel with the probe pins 6 as the first movable table 3a moves at a predetermined pitch, and to be able to position all the edges of the wiring film without overlapping. .

The liquid crystal display screen defect detecting device 1 includes a control unit 8, a driving unit 9 for controlling the amount of movement of the first moving table 3a and the second moving table 4a, an elevating means driving unit 10, a defect detecting unit. Storage unit 1 for storing position data of each mobile platform at the time
1, a voltage supply unit 12 for supplying a voltage of a predetermined frequency to each of the probe pins 6, a sensor unit 13 for amplifying and calibrating detection signals of a row of line sensors constituting the electromagnetic sensor 7, and detection start. An operation unit 14 outputs various operation command signals such as a command signal, and a display unit 15 displays various displays such as a non-defective product detection display and a defective product detection display.

When the control section 8 receives the detection start command signal, as shown in FIGS. 2 to 5, 1) the position data X and Y of the first and second movable bases are set to 0 (FIG. 2). The position of the second movable base farthest from the first mobile base is 0). 2) The movement command signals for the first and second moving tables are output to the driving unit. 3) Wait for a positioning completion signal from the drive unit. 4) Pin number n = 0 (Pin number n = sensor number n because probe pins and electromagnetic sensors are arranged correspondingly). 5) Output a probe pin lowering command signal to the lifting / lowering means driving unit. 6) Output a voltage supply command signal to the probe pin corresponding to the pin number n to the voltage supply unit. 7) Extract an output signal of the sensor unit corresponding to the sensor number n. 8) It is determined whether or not this output signal is larger than a reference value obtained in accordance with the intensity of the electromagnetic wave indicating conduction to the edge of the wiring film, and when the output signal is larger than the reference value, jump to 10). I do. 9) The sensor number n and the position data X of the first moving table are stored as position information of the disconnected wiring film in the storage unit. 10) Judge whether pin number n = N-1 or not, and when this is N-1, jump to 12). 11) Set n = n + 1 and return to 6). 12) Output a probe pin raising command signal to the lifting means driving unit. 13) It is determined whether or not the position data X of the first mobile platform is equal to or greater than the movement limit Xl. When the position data has reached the movement limit Xl, the process jumps to 15). 14) Return to 2) with position data X = X + p. 15) It is determined whether or not the position information (storage sensor number n and storage position data) of the disconnected wiring film is stored in the storage unit. When this is not stored, the original information is stored in the first and second movable bases. A position return command signal is output to the drive unit, and a non-defective display command signal is output to the display unit. 16) Retrieve the position information (storage sensor number n and storage position data) of the disconnected wiring film from the storage unit. 17) The called storage position data is set as position data of the first mobile platform. 18) Output a movement command signal of the first moving table to the driving unit. 19) After waiting for a positioning completion signal from the drive unit, a probe pin lowering command signal is output to the lifting / lowering unit drive unit. 20) Assume that the position data Y = Y + q (q is a minute pitch) of the second moving table. 21) Output the movement command signal of the second movable table to the drive unit and output the voltage supply command signal to the probe pin of pin number n to the voltage supply unit. 22) An output signal of the sensor unit corresponding to the sensor number n is detected, and it is determined whether or not the output signal is equal to or more than a predetermined reference value. At the same time, the position data Y of the second movable table and the position data X of the first movable table at that time are stored in the storage unit as defective portions of the wiring film (a separately provided marking device may be operated immediately). Jump to). 25) It is determined whether or not the position data Y of the second mobile platform has reached the travel limit Yl, and when this does not reach the travel limit Yl (the closest position to the first mobile platform), the process returns to 20). 26) It is determined whether or not the sensor number n is the last one in the position information of the disconnected wiring film, and when this is the last one,
Jump to 29). 27) A probe pin raising command signal is output to the lifting / lowering means driving unit, and a home position return command signal of the second movable table is output to the driving unit. 28) Call out the next storage sensor number n and storage position data X from the position information of the disconnected wiring film, and return to 17) (after returning to the original position of the second movable base). 29) An original position return command signal is output to the first and second movable bases, and a defective portion detection completion signal is output to the display unit. 30) End. It is configured so that

In the liquid crystal display screen defect detecting apparatus 1, when the liquid crystal display screen 2 after the glass plate is mounted is positioned at a predetermined position, the first movable base 3a and the second movable base 4a are moved to both ends of the liquid crystal display screen 2. Located in. Then, probe pin 6
Is lowered, and a predetermined number of probe pins 6 are brought into contact with the terminals of the liquid crystal display screen 2, and a voltage of a predetermined frequency is sequentially supplied to each of the wiring films connected thereto. At the same time, the detection signal of the electromagnetic sensor 7 fixed to the second movable table 4a located at the other edge of the liquid crystal display screen 2 is amplified and calibrated by the sensor unit 13 as the detection signal of the line sensor. At the same time, each time a voltage is supplied to each probe pin 6, each sensor unit 1
It is determined whether the output signal of No. 3 is equal to or greater than a predetermined reference value (output signal ≧ predetermined reference value), and it is determined whether an electromagnetic wave is generated at the edge of the wiring film. At this time, when no electromagnetic wave is generated, the storage unit 11 stores the sensor number n of the sensor unit 13 and the position data X of the first movable base 3a as position information indicating the disconnected wiring film. When this disconnection detection is performed for a predetermined number (N) of the probe pins 6, the probe pins 6 move up, and the first movable base 3a moves along the terminals of the liquid crystal display screen at a predetermined pitch (p), and the same. Is detected.

When the first movable base 3a moves and the disconnection detection is sequentially performed, and when the first movable base 3a reaches the terminal movement limit Xl of the terminal of the liquid crystal display screen 2, the storage section 11 stores the broken wiring film. It is determined whether or not the position information (storage sensor number n, storage position data) is stored. When the position information is not stored, an original position return command signal is output to the first and second movable bases and the display unit is displayed. A non-defective display command signal is output to 15.

When the position information (storage sensor number n, storage position data) of the disconnected wiring film is stored in the storage unit 11, it is called together with the storage position data in ascending order of the sensor number n. 1st mobile 3
This is set as the position data of a. At the same time, the driving unit 9
When the movement command signal of the first moving table 3a is output to the first moving table 3a and the first moving table 3a is positioned according to the stored position data, the moving command signal of the second moving table 4a is output to the drive unit 9 while the sensor is output. It is monitored whether the output signal of the sensor unit 13 corresponding to the number n has reached or exceeded a predetermined reference value.

During this time, when the output signal of the sensor unit 13 reaches a predetermined reference value, a stop command signal for the second mobile platform 4a is immediately output to the drive unit 9, and the second mobile platform 4a stops at that position. The respective position data Y and X of the second moving table 4a and the first moving table 3a at that time are stored in the storage unit 11 as defective portions of the wiring film.

Subsequently, the position information (storage sensor number, storage position data) of the disconnected wiring film is called from the storage unit 11, and a defective portion is similarly detected.
a and the position data X and Y of the second moving base 4a are stored in the storage unit 11, and when all defective parts are stored, the first moving base 3a and the second moving base 4a return to the origin positions, and The work of detecting the location is completed.

[0014]

As described above, according to the present invention, the probe pins are moved at a predetermined pitch above the terminals connected to the wiring film such as a liquid crystal / plasma display screen positioned at a predetermined position. Is brought into contact with the terminal to supply a predetermined voltage from the probe pin, and the electromagnetic sensor is moved in parallel with the probe pin to determine whether or not the detection signal of the electromagnetic sensor is equal to or more than a predetermined value. The position of the electromagnetic sensor is stored as the position information of the disconnected wiring film when the disconnection is not performed, and then the electromagnetic sensor is returned on the disconnected wiring film and further moved along the wiring film, and the detection signal of the electromagnetic sensor is set to a predetermined value. It is configured to detect a broken portion of the wiring film depending on whether or not the value has reached the value. Therefore, if there is a defective portion due to disconnection in the wiring film, this can be sequentially stored as the position of the electromagnetic sensor at that time, and the defective portion on the liquid crystal display screen is instructed by a separately provided repair device, and the repair work is performed. There are advantages such as being able to do.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a liquid crystal display screen defect detection device according to the present invention.

FIG. 2 is a flowchart illustrating a schematic operation of a first part of a control unit according to the present invention.

FIG. 3 is a flowchart illustrating a schematic operation of a second part of the control unit according to the present invention.

FIG. 4 is a flowchart illustrating a schematic operation of a third part of the control unit according to the present invention.

FIG. 5 is a flowchart illustrating a schematic operation of a fourth part of the control unit according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display screen defect detection apparatus 2 Liquid crystal display screen 3 X table 3a 1st moving stand 4 Y table 4a 2nd moving stand 5 Elevating means 6 Probe pin 7 Electromagnetic sensor 8 Control part 9 Driving part 10 Elevating means driving part 11 Storage part 12 Voltage supply unit 13 Sensor unit 14 Operation unit 15 Display unit

Claims (2)

[Claims] 1. A probe pin is moved at a predetermined pitch above a terminal connected to a wiring film of a liquid crystal display screen positioned at a predetermined position, and the probe pin is brought into contact with the terminal so that the probe pin moves from the probe pin to a predetermined position. And the electromagnetic sensor is moved in parallel with the probe pin to determine whether the detection signal of the electromagnetic sensor is equal to or greater than a predetermined value. When the signal does not reach the predetermined value, the position of the electromagnetic sensor is disconnected. The electromagnetic sensor is then returned to the disconnected wiring film and moved along this wiring film,
A defect detecting method for a liquid crystal display screen, wherein a defective portion of a wiring film is detected by a change in a detection signal of an electromagnetic sensor. 2. A first moving table which sequentially moves at a predetermined pitch, and a second moving table which moves at a predetermined interval together with the first moving table and is movable in a direction orthogonal to the first moving table. A probe is mounted on the movable table so as to move above a terminal connected to a wiring film of a liquid crystal display screen positioned at a predetermined position, and a predetermined voltage is supplied to the probe pin. A liquid crystal display screen defect detection device, wherein an electromagnetic sensor for detecting the intensity of electromagnetic waves in a non-contact manner is attached to the two movable tables.